Search for the chiral doublet bands in 122Cs

High spin states in the odd–odd nucleus 122Cs have been studied by in-beam γ-ray spectroscopy with a 107Ag(19F,1p3n) fusion-evaporation reaction at a beam energy of 85 MeV. A previously known πh11/2 ⊗ νh11/2 yrast band was confirmed and its spin I was re-examined. A ΔI = 2 band was identified, which together with another known ΔI = 2 band forms a side band of the πh11/2 ⊗ νh11/2 yrast band. The two observed πh11/2 ⊗ νh11/2 bands are proposed as a pair of chiral doublet bands in 122Cs based on a systematic comparison with those in the neighbouring odd–odd Cs isotopes, as well as the relativistic mean field and the triaxial particle-rotor-model calculations.

[1]  E. Paul,et al.  Planar and aplanar tilted bands in the odd–odd nucleus 132Cs , 2003 .

[2]  Wang He-zhou,et al.  Effect of Invariant Transformation in One-Dimensional Randomly-Perturbed Photonic Crystal , 2003 .

[3]  M. Jie,et al.  Breaking of Chiral Symmetry in 104Rh and Its Neighbouring Nuclei , 2003 .

[4]  C. Chiara,et al.  Systematic search ofπh11/2⊗νh11/2chiral doublet bands and role of triaxiality in odd-oddZ=55isotopes:128,130,132,134Cs , 2003 .

[5]  Liu Shi-yong,et al.  Self-aligned InP/InGaAs single heterojunction bipolar transistor with novel micro-airbridge structure and quasi-coplanar contacts , 2003 .

[6]  Zheng Yong,et al.  Search for the Chiral Band in the N =71 Odd-Odd Nucleus 126Cs , 2002 .

[7]  T. Kibédi,et al.  Candidate chiral band in 134 La , 2001 .

[8]  C. Chiara,et al.  Observation of chiral doublet bands in odd-odd N=73 isotones , 2001 .

[9]  E. Paul,et al.  Evidence for chiral symmetry breaking in 136 Pm and 138 Eu , 2001 .

[10]  D. Hartley,et al.  Chiral doublet structures in odd-odd n = 75 isotones: chiral vibrations. , 2001, Physical review letters.

[11]  T. Komatsubara,et al.  Rotational bands in 122 Cs , 2000 .

[12]  S. Frauendorf,et al.  Chirality of nuclear rotation. , 2000, Physical review letters.

[13]  Jingbin Lu,et al.  Yrast band in 122Cs , 1999 .

[14]  J. Meng,et al.  Tilted rotation of triaxial nuclei , 1997 .

[15]  Lu,et al.  Systematic study of spin assignments and signature inversion of pi h11/2 , 1996, Physical review. C, Nuclear physics.

[16]  D. C. Radford,et al.  ESCL8R and LEVIT8R: Software for interactive graphical analysis of HPGe coincidence data sets , 1995 .